• Korea Information Processing Society Review
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• v.22 no.5
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• pp.36-45
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• 2015

금융과 IT의 융합을 의미하는 핀테크(Fintech) 열풍이 전세계적으로 뜨겁게 불고 있다. 핀테크를 통해 신기술들이 금융 산업 전반에 융합되면서 새로운 형태의 금융서비스가 등장하고 기존의 금융 시스템들이 가져왔던 문제점들을 개선하는데 기여할 것으로 보인다. 하지만 핀테크 산업 활성화를 위한 지속적 규제 완화와 이용자 편의성을 위한 각종 절차의 간소화 그리고 채널 서비스 기술간의 융복합이 일어나는 환경에서 제공되는 핀테크 서비스의 안전성에 대해 우려가 있다. 핀테크 시대에 정보보안은 성장의 인프라이며 금융상품을 선택하는 중요한 기준이 될 것이므로 보안리스크의 정량화와 단계별 통제 방안을 수립하고 사용자 인증, 결제정보 보안, API(Application Programming Interface) 보안 등 필요한 보안요소를 사업모델에 맞게 적용함으로써 편리성과 보안성을 함께 확보할 수 있어야 한다. 본 연구에서는 정보보안 관점에서 핀테크의 서비스의 특징과 보안 취약점을 분석하고 관련 위험을 줄이기 위한 대응방안을 모색해 보았다.

• Journal of KIISE:Software and Applications
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• v.28 no.3
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• pp.285-297
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• 2001

본 논문에서는 특정한 객체의 색 분포 모델링으로부터 얻어지는 가중 색 히스토그램과 지배적인 색의 영상공간 분포특성을 이용한 내용기반 영상 검색 방법을 제안한다. 특정한 객체의 예로 사람 얼굴을 선택했고, 그것의 색 분포를 u*-v* 색도 공간에서 모델링 했으며, 모델의 정규화된 부피를 균등 양자화된 색도 공간의 각 빈(bin)의 히스토그램 값에 대한 가중치로 결정하고, 결정된 가중치를 히스토그램 정합 과정에 적용하였다. 또한 색 히스토그램 값이 큰 특정한 수의 빈으로 정의되는 지배적인 색의 영상 공간 분포를 가중 색 히스토그램과 함께 유사성의 측정기준으로 사용하였다. 제안한 검색 방법을 500여개의 영상에 대해 실험한 결과 제안한 방법이 얼굴을 포함하는 영상을 질의로 주었을 때 얼굴을 포함하는 영상을 우선적으로 찾는데 효과적임을 확인하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.1149-1151
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• 2008

본 논문에서는 학습자들의 학습특성 및 학습 능력에 따라 문제은행에서 문항을 선택하는 기준과 학습코스를 재구성하기 위한 방법을 제안한다. 본 논문에서 제안한 시스템은 학습단계와 평가단계를 연계하여 평가 단계에서 추정된 학습자의 능력에 따라 차기 학습단계에서 수준별 학습내용을 재구성하여 학습자에게 제공함으로써 합리적인 학습이 가능하도록 지원하고 있다. 이를 위해 학습자의 학습능력을 정확하게 판단 할 수 있도록 문항반응 이론에 의한 학습자 능력평가 모듈을 만들고, 가중치 값을 갖는 문항특성모델을 개발하여 적용함으로써 학습과정의 우선순위를 부여하여 학습코스를 재구성하는 시스템을 설계 및 구현하였다.

• Journal of Korean Society for Geospatial Information Science
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• v.17 no.3
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• pp.71-79
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• 2009

We expanded the 3D building information extraction method using shadow and vertical line from single high resolution image with meta information into the method for single high resolution image without meta information. Our method guesses an azimuth angle and an elevation angle of the sensor and the sun using reference building, selected by user, on an image. For test, we used an IKONOS image and an image extracted from the Google Earth. We calculated the Root Mean Square (RMS) error of heights extracted by our method using the building height extracted from stereo IKONOS image as reference, and the RMS error from the IKONOS image and the Google Earth image was under than 3 m. We also calculated the RMS error of horizontality position by comparison between building position extracted from only the IKONOS image and it from 1:1,000 digital map, and the result was under than 3 m. This test results showed that the height pattern of building models by our method was similar with it by the method using meta information.

• Journal of the Institute of Electronics and Information Engineers
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• v.52 no.5
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• pp.147-154
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• 2015

In this paper, we employed a model which defines the sensitivity according to the background luminance, so called JND (Just Noticeable Difference), and applied to the video coding. The proposed method finds out the maximum possible quantization parameter for the current unit based on the threshold of JND model and reduce the bitrate with similar perceptual quality. It selects the higher quantization parameter and reduce the bitrate when the reconstructed signal which is coded with higher quantization parameter is in a range of allowance based on the JND threshold, i.e. the signal has the similar perceptual quality compared to that is coded with the initial quantization parameter. The proposed algorithm was implemented on HM16.0, which is a reference software of the latest video coding standard HEVC (High Efficiency Video Coding) and the coding performance was evaluated. Compared to HM16.0, the proposed algorithm achieved maximum 20.21% and 6.18% of average bitrate reduction with the similar perceptual quality.

• Journal of the Korea institute for structural maintenance and inspection
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• v.9 no.1
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• pp.293-303
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• 2005

The girder wheel load distribution factors stated in the Korean Bridge Specification and AASHTO Standard Specifications do not account for the effect of skewness of plate girders, and very little research has been conducted on girder wheel load distribution factors. The purpose of the study is to propose load distribution factor formulas for skew plate girder bridges which comprise various parameters through structural analysis. To comprise the validity of finite element models used in this study analytic values are compared with the field test results. From the results it should be noted that span length is not such a dominant parameter compared with others. In view of better load distribution of interior girders, skew arranged cross beams or bracing are preferable, furthemore bracing system is more effective than cross beam system. By means of regression analysis on the basis of analytic results wheel load distribution factor formulas are proposed and compared with current codes.

• Journal of the Korea Institute of Building Construction
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• v.16 no.4
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• pp.305-311
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• 2016

This study examined the long-term inelastic characteristics, including unrestrained shrinkage and creep, of low-heat cement concrete under different ambient curing temperatures. To achieve the designed compressive strength of 42MPa, water-to-binder ratios were selected to be 27.5, 30, and 32.5% for curing temperatures of 5, 20, and $40^{\circ}C$, respectively. Test results showed that the shrinkage strains of concrete mixtures tended to decrease with the decrease in curing temperature because of the delayed evaporation of internal capillary and gel waters. Meanwhile, creep strains were higher in concrete specimens under lower curing temperature due to the occurrence of the transition temperature creep. The design models of KCI provision gave better accuracy in comparison with test results than those of ACI 209, although a correction factor for low-heat cement needs to be established in the KCI provision.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.31 no.3
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• pp.229-238
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• 2013

Development of methodologies to generate the small scale map from the large scale map using map generalization has huge importance in management of the digital topographic map, such as producing and updating maps. In this study, the selection methodology of map generalization for the road network data in digital topographic map is investigated and evaluated. The existing maps with 1:5,000 and 1:25,000 scales are compared and the criteria for selection of the road network data, which are the number of objects and the relative importance of road network, are analyzed by using the T$\ddot{o}$pfer's radical law and Logit model. The selection model derived from the analysis result is applied to the test data, and the road network data of 1:18,000 and 1:72,000 scales from the digital topographic map of 1:5,000 scale are generated. The generalized results showed that the road objects with relatively high importance are selected appropriately according to the target scale levels after the qualitative and quantitative evaluations.

• Tunnel and Underground Space
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• v.13 no.4
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• pp.287-293
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• 2003

A long vertical duct is an essential installation for extracting smoke to the ground level when a fire occurs in an underground space. Due to the limitations of its basic assumptions, the existing two-layer zone model is unsuitable to model smoke dispersion through a long vertical duct. Therefore, an assessment was made to investigate the applicability of the field model, which is based on the computational fluid dynamics (CFD). A similar configuration to the published experimental work was modeled to test the validity. It is clear that under a consistent decision criterion based on the mass fraction, the field model (CFD) is able to predict that the diffusion front progresses up the shaft with exactly the same rate as that in the empirical correlation equation. This result is for better than the mathematically obtained equations in previously published research. Therefore, it can be said that the field model is an excellent option to predict the smoke dispersion through the long vertical shaft.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.6
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• pp.147-154
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• 2015

Recently agile development process became increasing effectiveness, quality, attention to experts in customer satisfaction, as evidenced in this methodology when selecting projects promoting productive efficiency. With regard to contemporary needs and user requirements on the methodology selected to meet this paper is the product based Cross functional team suggested methodology Feature Team model to solve problems of this model, and organizing the Cross functional team, this team but this outcome (product) basis, were examined for the model that points to progress the development across multiple product as a functional unit, value-driven agile project through the Skills-based model and proposed a difference. And it examined the Agile Maturity metrics. PRINCE2 Agile Health-check entries future development direction of Agile techniques is a requirement of the project outset has studied the subject objective evaluation by the assumption that they can be changed at any time, not fixed this way and for the project team through research The proposed.